C8H8 --> minus 2 protons --> C8H6??? Really?
Not aromatic in my book for two reasons. One, how are you going to remove one proton, let alone two. Second, electrons need to be in a plane for the ring to be aromatic. With 8 sp2 centers on cyclooctatetraene, the two unlucky carbon atoms with the full negative charge are going to put the electrons in the sp2 orbital formerly occupied by the proton. that orbital is perpendicular to the ring. carbon atoms have been known to re-hybridize to accommodate aromaticity, but I don't see it going to sp in this case.
What were the other 3 choices, it's possible the answer sheet is wrong.